eh, not really. Tonga (285) = 280 = 380 = GTX 960
not that great for 1080p AAA... for MMOs, MOBAs, sure, its good. But Intel is targeting AAA, and i believe they are fully capable of reaching that. This is why i personally think it will be between 380X and 390 perf

Iv'e been a long time Radeon user (Crossfire setups since 2012), i know what Radeon drivers can and cannot offer in terms of drivers.
for DX11, and early DX12, there is room for drivers to improve. 2-3 years from now, it will be mostly game developers responsible for perf.

Also, this intel GPU is polaris. We know that much. No chance of it being VEGA, AMD would never sell their latest tech.
Polaris has pretty mature drivers, we also know what to expect w/custom drivers, due to PS4 Pro and XBOX 1X. Both custom polaris.